Hi Nick,
I've been thinking along those same lines for a little while.
There are several companies that produce epoxies that are more than durable enough for the job. One company is Cotronics (they'r on the web) that produces an adhesive that can handle 800 degrees F and is very strong.
I think if you were to cut the log off and leave at least one inch, you could dress up the stub and have a good surface to attach a flange that has stubs that are a little over size. You would then lay the flange on a table (coated with a release agent or wax paper) and set the head stubs into the flange. I think that I would coat the head stubs with epoxy first instead of trying to pour the epoxy around them.
Brace the head in this position untill cured. Now you will be able to port the head with out worrying about getting the head stubs to thin, as the epoxy and the flange stubs will support them.
What did you have in mind for an intake manifold?
The dual 2 barrel manifold that was posted for the 300 would be a good one to copy in the 200 size. It would be easy to weld up and give exellent performance. Perhaps with a pair of Holley Weber carbs would be good, that is if the manifold has a split plenum allowing the torque curve to come on a bit sooner allowing better low end torque.
Just My 2 cents,
John